312121021413 has 4 divisors (see below), whose sum is σ = 416161361888. Its totient is φ = 208080680940.

The previous prime is 312121021391. The next prime is 312121021451. The reversal of 312121021413 is 314120121213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 312121021413 - 2⁶ = 312121021349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312121021413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312121021453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52020170233 + ... + 52020170238.

It is an arithmetic number, because the mean of its divisors is an integer number (104040340472).

Almost surely, 2^312121021413 is an apocalyptic number.

It is an amenable number.

312121021413 is a deficient number, since it is larger than the sum of its proper divisors (104040340475).

312121021413 is a wasteful number, since it uses less digits than its factorization.

312121021413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104040340474.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 312121021413 its reverse (314120121213), we get a palindrome (626241142626).

The spelling of 312121021413 in words is "three hundred twelve billion, one hundred twenty-one million, twenty-one thousand, four hundred thirteen".